java 中的 java.time.temporal.WeekFields 类
原文:https://www . geesforgeks . org/Java-time-temporal-weekfield-class-in-Java/
周字段类表示周的定义，以提供临时字段实例。WeekFields 提供了五个字段，weekOfYear()、weekOfMonth()、dayOfWeek()、weekOfWeekBasedYear()和 weekBasedYear()，它们提供了对任何时态对象的值的访问。
每个不同的周字段都需要一个单独的字段实例，并且需要:
- 一周开始
- 最短天数
类申报:
public final class WeekFields
extends Object
implements Serializable
WeekFields 类从 java.lang.Object 类继承了以下方法:
- 克隆()
- 最终确定()
- getClass()
- 通知()
- notifyAll()
- 等待()
周字段类的方法:
| 方法 | 描述 | | --- | --- | | 星期（） | 此方法返回一个字段，以基于此周字段访问一周中的某一天。 | | 等于(对象对象) | 此方法检查该周字段是否等于指定的对象。 | | getFirstDayOfWeek() | 此方法获取一周的第一天。 | | getMinimalDaysInFirstWeek() | 此方法在第一周获取最少天数。 | | hashCode() | 此方法返回此 WeekFields 的哈希代码。 | | of(第一个星期，第一个星期) | 此方法从一周的第一天和最小天数获取 WeekFields 的实例。 | | 的(区域设置) | 此方法获取适用于区域设置的 WeekFields 实例。 | | toString() | 此方法获取此 WeekFields 实例的字符串表示形式。 | | weekBasedYear() | 此方法返回一个字段，以基于该周字段访问基于周的年份。 | | 每月周数() | 此方法返回一个字段，以基于此周字段访问一个月中的周。 | | weekOfWeekBasedYear() | 此方法返回一个字段，以访问基于该周字段的一年中的周。 | | 一年中的第几周() | 此方法返回一个字段，以基于此周字段访问一年中的周。 |例 1:
Java 语言(一种计算机语言，尤用于创建网站)
// Java program to demonstrate
// WeekFields class
import java.time.DayOfWeek;
import java.time.LocalDate;
import java.time.temporal.TemporalField;
import java.time.temporal.WeekFields;
public class GFG {
public static void main(String[] args)
{
// create WeekFields
WeekFields weekFields
= WeekFields.of(DayOfWeek.MONDAY, 1);
// creating separate temporal fields for each method
// apply dayOfWeek()
TemporalField dayOfWeek = weekFields.dayOfWeek();
// apply weekBasedYear()
TemporalField weekBasedYear
= weekFields.weekBasedYear();
// apply weekOfMonth()
TemporalField weekOfMonth
= weekFields.weekOfMonth();
// apply weekOfWeekBasedYear()
TemporalField weekOfWeekBasedYear
= weekFields.weekOfWeekBasedYear();
// create a LocalDate
LocalDate day = LocalDate.of(2021, 03, 31);
// get day of week for localdate
int dow = day.get(dayOfWeek);
// get week based year for localdate
int wby = day.get(weekBasedYear);
// get week of month for localdate
int wom = day.get(weekOfMonth);
// get week of week for localdate
int wow = day.get(weekOfWeekBasedYear);
// print results
System.out.println("day of week for " + day + " :"
+ dow);
System.out.println("week based year for " + day
+ " :" + wby);
System.out.println("week of month for " + day + " :"
+ wom);
System.out.println("Week of week for " + day + " :"
+ wow);
}
}
Output
day of week for 2021-03-31 :3
week based year for 2021-03-31 :2021
week of month for 2021-03-31 :5
Week of week for 2021-03-31 :14
例 2:
Java 语言(一种计算机语言，尤用于创建网站)
// Java program to demonstrate
// WeekFields class
import java.time.DayOfWeek;
import java.time.LocalDate;
import java.time.temporal.TemporalField;
import java.time.temporal.WeekFields;
public class GFG {
public static void main(String[] args)
{
// create WeekFields
WeekFields weekFields
= WeekFields.of(DayOfWeek.SUNDAY, 1);
// creating separate temporal fields for each method
// apply dayOfWeek()
TemporalField dayOfWeek = weekFields.dayOfWeek();
// apply weekBasedYear()
TemporalField weekBasedYear
= weekFields.weekBasedYear();
// apply weekOfMonth()
TemporalField weekOfMonth
= weekFields.weekOfMonth();
// apply weekOfWeekBasedYear()
TemporalField weekOfWeekBasedYear
= weekFields.weekOfWeekBasedYear();
// create a LocalDate
LocalDate day = LocalDate.of(2021, 12, 05);
// get day of week for localdate
int dow = day.get(dayOfWeek);
// get week based year for localdate
int wby = day.get(weekBasedYear);
// get week of month for localdate
int wom = day.get(weekOfMonth);
// get week of week for localdate
int wow = day.get(weekOfWeekBasedYear);
// print results
System.out.println("day of week for " + day + " :"
+ dow);
System.out.println("week based year for " + day
+ " :" + wby);
System.out.println("week of month for " + day + " :"
+ wom);
System.out.println("Week of week for " + day + " :"
+ wow);
}
}
Output
day of week for 2021-12-05 :1
week based year for 2021-12-05 :2021
week of month for 2021-12-05 :2
Week of week for 2021-12-05 :50
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